Discussion
Home ‣ Biochemical Engineering ‣ Downstream Processing Comments
- Question
For the extractions operation, the selectivity should be
Options- A. > 1
- B. < 1
- C. 1
- D. zero
- Correct Answer
- > 1
- 1. For cost analysis in a fermentor system, the depreciation cost varies from
Options- A. 5-6% of the capital cost
- B. 6-7% of the capital cost
- C. 6-10% of the capital cost
- D. 8-10% of the capital cost Discuss
- 2. An ion exchange resin is composed of
Options- A. polymeric network
- B. ionic functional groups
- C. counter ions
- D. all of these Discuss
- 3. Which of the operation does not come under upstream processing?
Options- A. Media preparation
- B. Inoculum development
- C. Effluent treatment
- D. Storage of raw material Discuss
- 4. Filtration leaf test results indicate that the filtration rate of a protein product is 100 dry lbs/(ft2 hr). What size production filter would be required to obtain 100 dry lbs of filter cake/hr?
Options- A. 1.54 ft2
- B. 3.08 ft2
- C. 65 ft2
- D. 65 lbs/ ft2.hr Discuss
- 5. Assuming the laminar flow across the filter, the rate of filtration (dVf/dt) can be expressed as a function of pressure drop Dp by the modified D'Arcy's equation as (where A is the area of filtering surface, K is the D'Arcy's filter cake permeability and L is the thickness of the filter cake)
Options- A. (1/A) dVf/dt = ?p/?(L/K)
- B. dVf/dt = (1/A)?p/?(L/K)
- C. (1/A) dVf/dt = ?p/? LK
- D. dVf/dt = (1/A)?p/? LK Discuss
- 6. The efficiency of cell disruption in a bead mill depends on the
Options- A. concentration of the cells
- B. amount and size of beads
- C. type and rotational speed of agitation
- D. all of these Discuss
- 7. Conventional adsorption is a
Options- A. reversible process
- B. irreversible process
- C. either reversible or irreversible
- D. none of these Discuss
- 8. If the solute passes through membrane freely, the the rejection coefficient (s) is
Options- A. 1
- B. 0
- C. >1
- D. <1 Discuss
- 9. The conventional filtration involves the separation of large particles generally
Options- A. dp>5?m
- B. dp>10?m
- C. dp>15?m
- D. dp>20?m Discuss
- 10. Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of
Options- A. 0.02 to 10?m
- B. 1-10A°
- C. 20-30?m
- D. 10-200A° Discuss
Downstream Processing problems
Search Results
Correct Answer: 6-10% of the capital cost
Correct Answer: all of these
Correct Answer: Effluent treatment
Correct Answer: 1.54 ft2
Correct Answer: (1/A) dVf/dt = ?p/?(L/K)
Correct Answer: all of these
Correct Answer: reversible process
Correct Answer: 0
Correct Answer: dp>10?m
Correct Answer: 0.02 to 10?m
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